[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 10/21] acpi/table: Introduce acpi_table_get_entry_madt to get specified entry
From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> This function could get the specified index entry of MADT table. This would be useful when it needs to get the contens of the entry. Cc: Jan Beulich <jbeulich@xxxxxxxx> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx> --- V4: Fix coding style and make the function only for MADT table --- xen/drivers/acpi/tables.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++ xen/include/xen/acpi.h | 2 ++ 2 files changed, 61 insertions(+) diff --git a/xen/drivers/acpi/tables.c b/xen/drivers/acpi/tables.c index 84a290f..c50bae4 100644 --- a/xen/drivers/acpi/tables.c +++ b/xen/drivers/acpi/tables.c @@ -219,6 +219,65 @@ void __init acpi_table_print_madt_entry(struct acpi_subtable_header *header) } } +static struct acpi_subtable_header * __init +acpi_get_entry(char *id, unsigned long table_size, + struct acpi_table_header *table_header, int entry_id, + unsigned int entry_index) +{ + struct acpi_subtable_header *entry; + int count = 0; + unsigned long table_end; + + if (!table_size) + return NULL; + + if (!table_header) { + printk(KERN_WARNING PREFIX "%4.4s not present\n", id); + return NULL; + } + + table_end = (unsigned long)table_header + table_header->length; + + /* Parse all entries looking for a match. */ + entry = (struct acpi_subtable_header *) + ((unsigned long)table_header + table_size); + + while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < + table_end) { + if (entry->length < sizeof(*entry)) { + printk(KERN_ERR PREFIX "[%4.4s:%#x] Invalid length\n", + id, entry_id); + return NULL; + } + + if (entry->type == entry_id) { + if (count == entry_index) + return entry; + count++; + } + + entry = (struct acpi_subtable_header *) + ((unsigned long)entry + entry->length); + } + + return NULL; +} + +struct acpi_subtable_header * __init +acpi_table_get_entry_madt(enum acpi_madt_type id, unsigned int entry_index) +{ + struct acpi_table_header *table_header = NULL; + + acpi_get_table(ACPI_SIG_MADT, acpi_apic_instance, &table_header); + if (!table_header) { + printk(KERN_WARNING PREFIX "%4.4s not present\n", + ACPI_SIG_MADT); + return NULL; + } + + return acpi_get_entry(ACPI_SIG_MADT, sizeof(struct acpi_table_madt), + table_header, id, entry_index); +} int __init acpi_parse_entries(char *id, unsigned long table_size, diff --git a/xen/include/xen/acpi.h b/xen/include/xen/acpi.h index bc73310..32d7a4f 100644 --- a/xen/include/xen/acpi.h +++ b/xen/include/xen/acpi.h @@ -74,6 +74,8 @@ int acpi_parse_entries(char *id, unsigned long table_size, int entry_id, unsigned int max_entries); int acpi_table_parse_entries(char *id, unsigned long table_size, int entry_id, acpi_table_entry_handler handler, unsigned int max_entries); +struct acpi_subtable_header *acpi_table_get_entry_madt(enum acpi_madt_type id, + unsigned int entry_index); int acpi_table_parse_madt(enum acpi_madt_type id, acpi_table_entry_handler handler, unsigned int max_entries); int acpi_table_parse_srat(int id, acpi_madt_entry_handler handler, unsigned int max_entries); -- 2.0.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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